An object
that cannot be overlapped with its mirror images,
namely,
that lacks the reflection symmetries,
is called chiral.
The chiral symmetry breaking gives rise to abundant functionality [1]}
such as
chiral magnetism
 [2]}, [3]},
chiral phononics
 [4]}, [5]}, [6]},
chiral photonics
 [7]},
and nonreciprocal conductivity
 [8]}, [9]}.
Recent experimental observations
have confirmed that
the chiral materials exhibit spin-selective phenomena,
including a large spin-polarization
of photoelectrons transmitted through
helical molecules
 [10]}, [11]}, [12]}
and
a large spin dependence
of the current-voltage characteristics
for the tunneling electrons
through helical molecules
 [13]}, [14]}, [15]}.
Even enantio-separation
and asymmetric electrochemical reactions
by magnetic electrodes
are reported
 [16]}, [17]}.
Furthermore,
generation of large spin current
was established
for the inorganic chiral crystals
 [18]}, [19]}, [20]}.
These phenomena
originated from the structural chirality
is collectively termed as
the chirality-induced spin selectivity (CISS)
 [21]}, [22]}, [23]},
where the spin is oriented parallel or antiparallel
to the velocity of an injected electron
depending on the materials' handedness.
